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We investigate the dynamics and rheological properties of a circularcolloidal cluster that is continuously sheared by magnetic and optical torquesin a two-dimensional (2D) Taylor-Couette geometry. By varying the two drivingfields, we obtain the system flow diagram and report the velocity profilesalong the colloidal structure. We then use the inner magnetic trimer as amicrorheometer, and observe continuous thinning of all particle layers followedby thickening of the third one above a threshold field. Experimental data aresupported by Brownian dynamics simulations. Our approach gives a uniquemicroscopic view on how the structure of strongly confined colloidal matterweakens or strengthens upon shear, envisioning the engineering of rheologicaldevices at the microscales.

Laning, Thinning and Thickening of Sheared Colloids in a Two-dimensional Taylor-Couette Geometry